Oblique entry is the design principle by which a reader or participant encounters the continuum sideways — through a practically useful standalone offering — without initially knowing they have entered a developmental sequence. tsp is the primary oblique-entry node (behavioral psychology, no prerequisite); pmm is the attention-capture layer; upc inside sgbh is an oblique entry into the facilitation model. Each oblique-entry offering delivers a complete standalone value while planting seeds for what follows; the reader’s recognition of the deeper sequence is not required for the offering to work.